Ans 2) bSince A B exists, therefore no. of rows in B = no. of columns in A. B has n rows.
Now, B A exists no. of columns
is B = no. of rows in A B has m columns.
Hence B is of order n m.
Ans Desc 2)Since A B exists, therefore no. of rows in B = no. of columns in A. B has n rows.
Now, B A exists no. of columns
is B = no. of rows in A B has m columns.
Hence B is of order n m.